This week on Tech Weekly Jemima Kiss sits in for Aleks Krotoski. Jemima is joined by Alex Hern, Samuel Gibbs, Tom Brewster and by Charles Arthur down the line from San Francisco.

The team discuss Apple's launch of the iOS8 operating system; the official warnings about the Cryptolocker ransomware virus; and what to do to protect your data from attack.

Also: Charles Arthur interviews Wes Miller from the analysts Directions On Microsoft to find out what the future holds for this tech giant and how it plans to battle the might of Google.

Dancers scale the wall of a New York building to promote the launch of the long-awaited Vista operating system from Microsoft on Monday, Jan. 29, 2007 in New York. Picture: Mark Lennihan/AP Photograph: Mark Lennihan/AP